/**
 * Created by PanJiaChen on 16/11/18.
 */

/**
 * @param {string} path
 * @returns {Boolean}
 */
export function isExternal(path: string) {
    return /^(https?:|mailto:|tel:)/.test(path);
}

/**
 * @param {string} str
 * @returns {Boolean}
 */
export function validUsername(str: string): boolean {
    return str.length <= 4;
}

/**
 * @param {string} url
 * @returns {Boolean}
 */
export function validURL(url: string) {
    const reg = new RegExp('/^(https?|ftp):' +
        '\\/\\/([a-zA-Z0-9.-]+(:[a-zA-Z0-9.&%$-]+)*@)*((25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9][0-9]?)' +
        '(\\.(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])){3}|([a-zA-Z0-9-]+\\.)*[a-zA-Z0-9-]+\\' +
        '.(com|edu|gov|int|mil|net|org|biz|arpa|info|name|pro|aero|coop|museum|[a-zA-Z]{2}))(:[0-9]+)' +
        '*(\\/($|[a-zA-Z0-9.,?\'\\\\+&%$#=~_-]+))*$/');
    return reg.test(url);
}

/**
 * @param {string} str
 * @returns {Boolean}
 */
export function validLowerCase(str: string) {
    const reg = /^[a-z]+$/;
    return reg.test(str);
}

/**
 * @param {string} str
 * @returns {Boolean}
 */
export function validUpperCase(str: string) {
    const reg = /^[A-Z]+$/;
    return reg.test(str);
}

/**
 * @param {string} str
 * @returns {Boolean}
 */
export function validAlphabets(str: string) {
    const reg = /^[A-Za-z]+$/;
    return reg.test(str);
}

/**
 * @param {string} email
 * @returns {Boolean}
 */
export function validEmail(email: string) {
    const reg = new RegExp('^([A-Za-z0-9_\\-\\.])+\\@([A-Za-z0-9_\\-\\.])+\\.([A-Za-z]{2,4})$');
    return reg.test(email);
}

/**
 * @param {string} str
 * @returns {Boolean}
 */
export function isString(str: any) {
    if (typeof str === 'string' || str instanceof String) {
        return true;
    }
    return false;
}

/**
 * @param {Array} arg
 * @returns {Boolean}
 */
export function isArray(arg: any) {
    if (typeof Array.isArray === 'undefined') {
        return Object.prototype.toString.call(arg) === '[object Array]';
    }
    return Array.isArray(arg);
}
